Automatic die



H. F. NEUMEYER AUTOMATIC DIE.

APPLICATION FILED MAY 29. 1920.

1,399, 7, Patented Dec.'13, 1921.

3 SHEETS-SHEET I.

40 f if 71/- WITNESSES ATTORNEY H. F. NEUMEYER. AUTOMATIC DIE APPLICATION FILED MAY 29, 1920.

1 99,867, Patented Dec. 13, 1921.

3 SHEETS-SHEET 2.

#0 39 3; L H A En-4 mm 54 15 as a] V 4a" 4/ 9 1/ zy-ll 3 a; 73 M WITNESSES 1' S ATTORNEY H. F. NEUMEYER.

AUTOMATIC'DIE.

APPLICATION FILED MAY 29, 1920- 13995 7, Patented .Dec. 13, 1921.

3 SHEETS-SHEET 3.

jilii l mqyeh INVENTQR,

WITNESSES I BY I I I I g SJW 1 a 2. j 1 I Fig. 4 is a longitudinal cross' section on.

hair sr'rris AUTOMATIC DIE.

- HORACE FALK NEUMEYER, 0F AoUNGInPENNSY NIA.

Specification of Letters Patent.

7 Application filed May 29, 1920. .Sei'ial No. 385,303. 7 I 1 To all whom it mag concern:

turret base, and whose construction is such that the manufacture thereof is simplified.

A further obj ect is to provide a die of the automatic type which eliminates the use of the unsatisfactory spiral springs ordinarily employed to give the blades a normal tendency to separate. y

Other objects will appear as the description is proceeded with.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming part of this specification, with the understanding,

however, that the invention is not confined to any strict conformity with the showing in the drawings, but may be changed and modified so long as such changes and inodifi cations mark no material departure from the salient features of thefinvention as expressed in the appended claims. I

In the drawings, j 1

Figure 1 is an elevation of' av die constructed in accordance with the'present invention and adapted to be used witha turret lathe. I Fig. 2 is a top planview of the same. Fig. 3 is a section on the line 33- of the line 4-4 of Fig. 2. i

Fig. 5 is another longltudmal cross-section showing particularly the mounting'of the die blades.

Fig. 6 is a transverse 'cross-sectionon the line 66 of Fig. 5. r j v Fig. 7 is an elevation. looking from the front or left hand end of Fig. 1. V

Fig. 8. is a cross-section on the line 88 of Fig. 1.

' Fig. 4.

the die blades.

dies of auto Fig. 9 1s a section on the line9 9gof -Fig. IQ is a detail of the cam ring. z I Fig. 11 is a perspective view of one of The die comprises a body proper l2 having an extended shank 16 integral therewith for holding the body in a turret lathe; The

'PatentedDee13, 1e21,

body 12 isslotted as indicated at 13 to re- I ceive the die blades. Inrthe' illustrated em- Y bodiment there are four of these slots shown, each to receive a die blade. Obviously, more or less than'this number of die blades might be employed. j The shank 16,.is flattened as indicated at 17 for an obvious purpose. I

The body 12 has a raised shoulder 14 adjacent its j oiningwith the shank 16. The slots- 13 extend for theentire length ofthelbody 12. Bores 15 are provided on the shoulder '14 intermediate the slots, and pins .19 extend between adjacent bores 15 f and provide pivotal elements for thedie blades 20. The .pins 19 are removable wherebythe blades may be taken out for sharpening'or for replacement by other blades of different sizes.

A ring 21 is secured to the outer end of body 12 by means of screws or similar elebody from spreading and'also. provides an fments 22. The ring 21 keeps the slotted abutment for the blade adjusting means to a be described. The'ring {21, as seen Y'most clearly in Fig. 7, ,will prevent the blades I from spreading apart so as to project be yond the peripheryof the body. 12. f r

The shank 16is 'providediwith a number of grooveslS, which grooves are in .alinement'with' the. slots '18. .The grooves 18 receive fiat springs '23 which, as'seen .111 'Fig. 5, bear against the under sides of the die blades to impart to the latter a tendency toispread or move outwardly. A collar 24 fits over shank 16 and is provided with set screws 7 25 passing throughthecollar and engaging V with the ends of the flat springs 23 to main- 3 tain the latter in position.

Th blades. 20 have the/usual teeth an their outer endsfand ribs .27, the'ribs, and j teeth being provided on opposite edges of theblades. The ribslaredesigned to be engaged-by adjusting means. The adjusting means includes amaster ring 28 and a cam ring 44. The master ring is 'slidably mounted on the body 12 but ma notv rotate there- 7 on, while the camjring is rotatably mounted upon the master ring butis incapable independent longitudinal movement with respect' to the body.

. The master ring28 .fiaisphgije dn the j i body 12 and is prevented from rotating by. a stud 29 screwed into the ring andihaving its lower end extending into a slot 30 provided on the body. at dian'ietrically opposite polnts on the body,

- as shown in Fig. e,- and" these slots, unlike the slots 13, extend for only a portion of the length of thebody stopping short of each end thereof. A T-shaped bar including the leg 31 and head 32 is secured by screws 83 (Fig. 1), to the masteri'ing 28 and is shaped on its under side to fit upon the j periphery of body 12. The end of leg 31 remote from the head 32. has a. bore 84 :fOI'l-llfi reception of a: set screwfwhich will 'be described.

The width of the bar: 31 is greater than the width of the slot 30, whereby the slot will be covered by the bar; .when the master ring is; in that position removed from the outer end' oi": the tool.

A substantially U-shaped bar 35 is secured tot-he master ring at a point diametrically opposite to where the -T-shap edbar 81 The U-shaped lea-r235 is'properly shaped to fit over the curved'body 12 and vhas arms 37 fitting against the inner faceof the ring 28 and secured thereto'by elements 38. Thefmaster ring 28has a slot provided where the U shaped bar 35 is secured,

which slot-is in alinement with :the passagewaybetween the armsot the ll-shaped memher, as shown in Fig. 2. "Theend of bar 335 remote from its attached end is, provided with a bore 39 for the'recept-ion of aset screw 40. The bore 34 of the'T-shaped bar 31 receives a similar set screw 40. The two set screwsA-O are received in the dia metrically j oppositeslots 30, and in con- 7 bore 58 provided to receive an achusting bar junction with the stud 29, provide means by which the master ring 28 is prevented The master ring 28 is providedwith' an annular raised shoulder tl which has notches 42 provided at lntervals and extending transversely thereof.

is provided for. the cam ring 44.

The cam ring, shown by itself in Fig. 10,. has our cam faces 43 wh ch are beveled,

each cam face eXt-end'ingflior a quadrant. These be eled camfacesare designed to engagewith theribs 27 of the die blades.

'Vihenthe master ring is adiusted in the de-I sired-position upon the body with the cam I ring; in enga ement with the-ribs of the die blades. it will vbe clear that by moving the cam ring in eithe direction, the blades will be fo cedinwardlv or allowed to move outward as 'the case may bathe springs resisting fbutnot preventing, lnwa'rd movement of the blades. This action may perhans be bestunderstood,by a consideration of l ig. 5. The ribs 27 have their outer There are two slots 30.

venient means, as screws 47. to the cam Upon theouter SlClG of the ring 28 an annular seat &3

Fig. ll'to engage with the beveled cam faces 45.

A slide attachment 46 1s secured by con- 'At-diametrically opposite points upon the cam ring a second attachment is provided including a housings-8i having ears i9 secured by screws 50 to'the cam ring; This second attachmentalso embraces the annu-' lar shoulderl and cooperates with the slide 46 for'jholding cam ring and master ring together. The housing i8 supports means "for engaging with thenotches 42; whereby edges. appropriately curved as indicated in the an ular 'iosition of the cam rind with respect to the master ring maybe main- 51 at the :upper end andia head 55 at the ilower end. fA spiral spring 53 is contained the stem locked position. The head 55 has tooth .54 integraltherewith adapted to engage with onset the notches 4-2. The head has a groove 57 therein wlth which a screw ;,56

"engages." The screw 56 prevents rotation of the stem and head within the housing. The

knob5l provides convenientzmeans by which This means includes, as seen in. i'Fig'sg and 8, a stem 52 oarrylng aknob the tcoth or pawl'o l, may be lifted out of engagement with the notches; whereupon the cam ring maybe rotated in either direct on. as desired.

..The shank 16 has a central longitudinal 59 having a head 60 at one end "for engagement with the work. The 'adjustingbar 59 isfiattened, as indicated at 61, throughout "the greaterportion of its length and is shorter than the combined length of the body and shanln'as seen in Figs. 4 and 5- The endof the bar adjacent the head 60 is pro- 'vided with a plurality of screw-threaded bores 62 adaptedto receive the screw-thread ed end of a set stem 63 which extends upwardly from the adjusting bar through one meansby which the adjustingbar may be I of the slots 30. The set stem 63 provides moved longitudinally of the die. The upper end of the set stem. is received within the The position of the adjustable bar relative to. the, body is maintained by the se screws 40 WlUClI pass through bores provldedin' a collar 6-1 surround ng the adjusting bar 59 and whose inner ends bear against theflat tened faces 61. Then the set screws 40 are clamped upon the adjusting bar 59, it will be clear that the adjusting bar will be fixed relative to the master ring 28 and the parts carried thereby. When the work is brought into engagement with the head 60, the thrust will be transmitted through the set screws 40 and the bars 31 and 35 to the master ring which will move inwardly, thereby releasing the die blades from engagement with the work; thus the die is an automatic self-opening one. The length of the thread cut by the blades is regulated by the position of the set stem 63 relative to the set screws l0.

When the die blades are parallel, they will cut a thread of standard size. When they are depressed, as by rotation of the cam ring when brought into engagement with the ribs 27, the depth of the cut will be increased. When the die blades are allowed to swing outwardly toward engagement with the outer ring 21, the depth of the cut will be less than standard; thus it is seen that the depth of the threads as well as the length may be varied at will.

The tool of the present invention is exceptionally easy and rapid in its adjustment. It is simple in construction and may be readily manufactured. The blades are easily removed for sharpening or replacement by blades designed to cut threads of different sizes. The tool is compact and may be easily swung over the turret base, while other tools of this kind are frequently too large to be so swung. The use of the flat springs is found to ofi'er many advantages over coil springs which it is found continually give trouble. The fiat springs may be readily removed by merely loosening the collar 24. In fact, all the parts of the tool are easy to get at. The cam ring, in conjunction with the sliding master ring, provides convenient means by which very exact adjustment of the depth of the thread to' be cut may be made.

What is claimed is 1. In a die, a slotted body, blades pivotally mounted in the slots, flat springs bearingagainst the under edges of said'blades to impart to the latter a tendency to separate, said body having a reduced extension, and a collar mounted on said extension and having clamping screws engaging the springs to hold the ends of each spring against the body.

2. In a die, a slotted body, blades pivotally mounted in the slots, grooves in alinement with said slots, fiat springs bearing against the under edges of said blades to impart to the latter a tendency to separate, said grooves receiving the ends of said springs and permitting insertion or with drawal of the same, and means mounted on the body to clamp the springs in position.

3. In a die, a slotted body having a reduced extension, blades pivotally mounted in the slots, grooves in alinement with said slots, flat springs bearing against the under edges of said blades to impart to the latter a tendency to separate, said grooves receiving th ends of said springs and permitting insertion or withdrawal of the same, and a collar mounted on said extension and having clamping screws adapted to hold the ends of each spring in its respective groove.

4c- In a die, a hollow body having slots opening into the interior cavity thereof, blades each pivotally mounted in one end in the slots, means forcing the blades apart, and a ring secured to the outer end of the die to prevent the sub-divisions of the body made by the slot from spreading, said ring also acting as a stop for the free ends of the blades.

5. In a die, a slotted body, blades pivotally mounted in the slots, springs bearing against the under edges of said blades to impart to the latter a tendency to separate, a master ring slidable upon said body, and a cam ring rotatably held upon the master ring and engageable with the blades to effect adjustment of the latter.

6. In a die, a slotted body, blades pivotally mounted in the slots, springs bearing against the under edges of said blades to impart to the latter a tendency to separate, a master ring slidable upon said body, and

a cam ring rotatably held upon the master ring and engageable with the blades to effect adjustment of the latter, said cam ring having beveled arcuate cam faces, the blades having projecting ribs adapted -to be engaged by said cam faces.

7. In a die, a slotted body, blades pivotally mounted in the slots, springs bearing against the under edges of said blades to impart to the latter a tendency to separate, a master ring slidable upon said body, a cam ring rotatably held upon the master ring and engageable with the blades to effect adjustment of the latter, and adjustable means mounted on the cam ring and engageable with the master ring to hold the cam ring in the desired angular relation with respect to the master ring.

8. In a die, a body, blades pivotally mounted on the body, springs imparting to the blades a tendency to separate, means for preventing undue separation of the blades, means for holding the blades in adjusted positions relative to each other, means operable by engagement with the work for releasing the holding means and permitting the blades to spread to their fullest extent, said last-named means comprising an adjusting bar, a set stem secured to the bar, and clamping means for securing the bar and the adjustable blade holding means tov the blades a tendency to separate, means for preventing undue separation of the blades, means for holding the blades in adjusted positions relative to each other, means 0perable by engagement with the Work for releasing the holding means and permitting the blades to spread to their fullest extent, said last-named means-comprising an adjusting bar, a' head at one end of the bar for engagement with the Work, a set stem 10 In testimony, that I claim the foregoing 15 as my own, I have hereto affixed my signature HORACE FALK NEUMEYER. 

